Remote sensing of water quality parameters over Alqueva Reservoir in the south of Portugal

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Potes, M (Author) Other; Costa, MJ (Author) Other; da Silva, JCB (Author) FCUP; Silva, AM (Author) Other; Morais, M (Author) Other

Journal

Title: International Journal of Remote Sensing

Vol. 32 No. 22

Pages: 3373-3388

ISSN: 0143-1161

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 23 Citations

Scopus - 26 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-002-YV8

DOI: 10.1080/01431161003747513

Abstract (EN): In this study, the potential of MEdium Resolution Imaging Spectrometer (MERIS) to describe variations of optically active substances over Alqueva artificial lake is investigated. Limnological laboratory analyses of the water samples collected monthly, from 2003 to 2006, are used in combination with MERIS. The water surface spectral reflectance is derived from Level1b MERIS data, using radiative transfer calculations to account for the atmospheric effects. The lake water spectral surface reflectance is combined with laboratory analyses of cyanobacteria total densities as well as chlorophyll a concentrations and empirical algorithms for both quantities are derived. The results obtained are compared with independent laboratory analyses from 2007, with good correlation coefficients obtained both for cyanobacteria (R = 0.93) and chlorophyll a (R = 0.80). The methodology proposed here has been developed to inexpensively monitor Alqueva Reservoir water quality in terms of cyanobacteria and chlorophyll a on a regular basis, and to provide useful information to the authorities.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16